/**
 * Copyright 2000 self.com.au
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License. (http://www.apache.org/licenses/LICENSE-2.0)
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed 
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for 
 * the specific language governing permissions and limitations under the License.
 *
 * <dhamma-message src="Atisha (11th century Tibetan Buddhist master)">
 * 	The greatest achievement is selflessness. The greatest worth is self-mastery.
 * 	The greatest quality is seeking to serve others. The greatest precept is continual awareness.
 * 	The greatest medicine is the emptiness of everything. The greatest action is not conforming with the worlds ways.
 * 	The greatest magic is transmuting the passions. The greatest generosity is non-attachment.
 * 	The greatest goodness is a peaceful mind. The greatest patience is humility.
 * 	The greatest effort is not concerned with results. The greatest meditation is a mind that lets go.
 * 	The greatest wisdom is seeing through appearances. 
 * </dhamma-message>
 *
 * @author Ashin Wimalajeewa
 */
package self.amigo.editor.cmd;

import java.util.Collections;
import java.util.List;

import self.gee.IGraphicElement;
import self.gee.ILinkGraphic;
import self.gee.ILinkableGraphic;
import self.gee.editor.EventManager;
import self.gee.editor.ICommand;
import self.gee.editor.IDiagramEditor;

public class ElementCreation implements ICommand {
  private IDiagramEditor  editor;
  private EventManager    controller;
  private IGraphicElement element;
  
  private ILinkableGraphic sideA, sideB;
  
  public ElementCreation( IDiagramEditor ed, EventManager ctl, IGraphicElement elem ) {
    editor = ed;
    controller = ctl;
    element = elem;
    initLinkElement();
  }
  
  public void execute() {
    List selection = Collections.singletonList( element );
    controller.diagramLayer.beginUpdate();
    
    if ( element instanceof ILinkGraphic ) {
      ((ILinkGraphic) element).linkSideA( sideA );
      ((ILinkGraphic) element).linkSideB( sideB );
    }
    element.setLayer( controller.diagramLayer, true );
    
    controller.diagramLayer.endUpdate();
    editor.setSelectedElements( selection );
    editor.getSource().redraw();
  }
  
  public void undo() {
    List selection = Collections.singletonList( element );
    java.util.List refreshedElements = SelectionUtils.toNewElementList( selection, controller.diagramLayer );
    IGraphicElement refreshedElement = (IGraphicElement) refreshedElements.get( 0 );
    controller.diagramLayer.beginUpdate();
    
    refreshedElement.remove();
    
    controller.diagramLayer.endUpdate();
    editor.setSelectedElements( Collections.EMPTY_LIST );
    editor.getSource().redraw();
  }

  private void initLinkElement() {
    if ( element instanceof ILinkGraphic ) {
      sideA = ((ILinkGraphic) element).getSideA();
      sideB = ((ILinkGraphic) element).getSideB();
    }
  }
}